How can you tell if an experiment is controlled?

Answers

Answer 1
An experiment in which an observer tests a hypothesis by looking for changes brought on by alterations to a variable. In a controlled experiment, an independent variable is the only factor that is allowed to be adjusted, with the dependent variable as the factor that the independent variable will affect.
Answer 2
a controlled experiment holds everything constant

Related Questions

Photosynthesis true or false increasing light intensity decreases rate of photosynthesis

Answers

As light intensity increases, the rate of photosynthesis will increase as long as other factors are in adequate supply. As the rate increases, eventually another factor will come into short supply. So it's false.

In Photosynthesis, as the intensity of light increases, the rate of photosynthesis also increases. Thus, the given statement is a false statement.

What is Photosynthesis?

Photosynthesis is the process of formation of sugar (carbohydrate) in the chloroplast of leaf of the plants. The chlorophyll pigment present in the chloroplast are responsible for trapping sunlight into the cell, this facilitates the process of photosynthesis.

The rate of photosynthesis is the amount of carbohydrate formed and oxygen released with respect to change in time. The rate of photosynthesis depends upon factors like light intensity, wavelength, etc. The rate of photosynthesis is directly proportional to the intensity of light.

Therefore, the given statement is false.

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In humans, the haploid number of chromosomes is 23. independent assortment has the possibility of producing __________ different gametes. in humans, the haploid number of chromosomes is 23. independent assortment has the possibility of producing __________ different gametes. 1 million 223 232 462

Answers

The answer to this question would be: 2^23

When the gene is dividing, the chromosome pair, which was made by 2 single chromosome, will be divided into two single haploid chromosomes. That means there is two kind of possibilities for each chromosome. If there are 23 chromosomes then it will be 2^23 possibilities

The increase of muscle size and muscle fibers is called:

Answers

Answer:hypertrophy

Explanation:

In the body, lipids _____.
a. contribute to proper body hydration
b. stimulate the production of vitamins and minerals
c. help maintain cell membranes
d. are necessary for the absorption of dietary fiber

Answers

In the body, lipids helps maintain cell membranes. Lipid is defined as a substance of biological origin which is soluble in nonpolar solvents. It is composed of a group of naturally occurring molecules. Which includes fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. Its main biological functions involves storing energy, signaling, and acting as structural components of cell membranes.

Answer: help maintain cell membrane

Explanation:

The fact that humans are related to chimpanzees can be seen in linnaean taxonomy, where both are
a. from the family hylobatidae.
b. all of the choices are correct.
c. in the superfamily hominoidea.
d. of the suborder strepsirhini.

Answers

They are both in the superfamily hominoidea. This classifies species that have a tubular tympanic bone, dental formula that includes incisors, molars, and rounded cusps, broad nasal regions, no tail, broad palates, long upper limbs, hind limbs, a large brain, and a size between 4 and 200 kilograms.

The skin pigment ____ is responsible for the skin color of dark-skinned people.

Answers

I believe it’s melanin , if I’m not mistaken.
I’m pretty sure it is Melanin

In which marine environment would you find the greatest diversity of species?

Answers

You would the find the greatest diversity of species in a temperate kelp forest.
I hope this helps.

Which organ was believed to be the organ of thought for the egyptians?

Answers

The Egyptian heart

The Egyptians believed that the heart, rather than the brain, was the source of human wisdom, as well as emotions, memory, the soul and the personality itself.


Why is it important for each cell to be surrounded by a cell membrane that prevents large molecules from leaving the cell?

Answers

Hi there.

The cell membrane keeps organelles and ribosomes from exiting the cell. When molecules enter the cell, the membrane also prevents it from leaving as the molecule is needed to carry out processes.

~

props to the flashcard on Quizlet,

The upper limit of the zone of saturation is called _____.


the water table


the zone of aeration


an aquifer


a spring


Answers

The right option is; the water table

The upper limit of the zone of saturation is called the water table.

Water table is the top level of an underground surface where the rocks or pores of the ground are indelibly saturated with water. The water table removes the zone of aeration that is situated on top of it from the groundwater zone that is situated beneath it. Certain conditions such as amount of precipitation used by plants, climatic differences, and withdrawal of large amounts of water from wells, affect the water table and make it to fluctuate both with the seasons and from year to year.



Answer:

A. The Water Table

Explanation:

Which organelle would have a protein fingerprint most similar to the cell membrane?

Answers

All cells have a protective covering known as cell membrane. In plants, the cell membrane is further protected by another layer called cell wall. All the organelles present inside the cells are membrane bounded structure.
Cell membranes are made up of phospholipid bilayer with extrinsic and intrinsic proteins. From the studies on the plasma membrane structure, it was found that the protein fingerprint of MITOCHONDRIA and CHLOROPLAST are most similar to the cell membrane.

All BUT one of the conditions will increase the reaction rate of an enzyme. The condition that will NOT increase the reaction rate is
A) reaching optimal pH.
B) reaching optimal temperature.
C) decreasing the concentration of the enzyme.
D) increasing the concentration of the substrate.

Answers

 decreasing the concentration of the enzyme.

Decreasing the concentration of the enzyme, I just took the test.

Which process MUST occur before mitosis and meiosis can occur?

Question 3 options:

DNA transcription


DNA replication


DNA conjugation

Answers

dna replication so it replicates your DNA to occur

What affects about 1% of chronic alcoholics and involves a defect in remembering recent events?

Answers

The answer is Wernicke – Korsakoff Syndrome. This is a kind of brain disorder triggered by an absence of vitamin B-1. The syndrome is essentially two separate circumstances that can happen at the same time. Typically, people get the indications of Wernicke’s encephalopathy first. This syndrome affects the parts of your brain that regulate memory. Also, chronic alcohol abuse or alcoholism, is the most common reason of WKS.

Which organelle would you expect to find in plant cell but not an animal cell?

Answers

Chloroplasts. Chloroplasts are used in plants to perform photosynthesis nd are what make them green. 

Serial repetition of segments is a defining characteristic of which worm phylum?

Answers

Serial repetition of segments is a defining characteristic of ANNELIDS. 
Phylum Annelids is made up of worms which can be found either in water or on land. Those that live on land live in burrows. The mode of feeding of these worms varies; they can be scavengers, carnivores or blood s.uckers. The activity of worms that live in the soil increase the fertility of the soil.

How many chromosomes would be found in an allotetraploid plant if its parent species had diploid numbers of 4 and 6 respectively?

Answers

An allotetraploid plant has its chromosomes derived from two different plants (different chromosomes) and it has 4 chromosomes of each type of chromosome because it received two copies of each chromosome and doubled it. So, this plant, would have 20 chromosomes. (4+6)×2=20
4 -> 2n of one parent
6 -> 2n of the other parent
2 times because it is a "tetraploid" plant and it already has 2 copies of each of its parents chromosomes.

Environmental Science Question!

Question 4 (multiple choice)
Which of the following describes the depletion of a renewable resource?

A. the hunting of excess deer to maintain a healthy population size
B. mining coal in areas where it is plentiful
C. intensive cultivation of farmland that exhausts nutrients
D. increased use of solar energy to generate electrical power

Answers

C. Intensive cultivation

Can someone help we with unscrambling these words on cells? One modern technique of examining cell contents is by using cell (tiontioncaraf) The cell's nucleus controls the cell's activities, many of which takes place in the (legselonar)

Answers

One modern technique of examining cell contents is by using cell (fractionation) The cell's nucleus controls the cell's activities, many of which takes place in the (organelles)
For the first one its one of these: FORNICATION, CONTRITION       INFARCTION, INFRACTION   

For the second its one of these:
ORGANELLES, ALLERGENS, ORGANELLE, SLOGANEER        

What substrate is digested by the enzyme protease?

Answers

protein
:333333333333

Select all of the answers that apply. Four laws or principles are involved with the study of stratigraphy. They are _____. 1 law of original horizontality 2 law of superposition law of original lateral continuity 3 law of gravity and oppositional force 4 law of cross-cutting relationships

Answers

Four laws or principles are involved with the study of stratigraphy. They are law of original horizontality, law of superposition law of original lateral continuity, and law of cross-cutting relationships.

Answers that apply: 1, 2, and 4 or the first, second, and fourth option.

Answer:

Option (1), (2) and (4) are the correct

Explanation:

According to the Steno, the four laws that deals with the study of stratigraphy are as follows-  

Law of Superposition- this law states that in a geochronological sequence the rock layers that are present at the top are the youngest and the rock layers that lies at the bottom are the oldestLaw of Original horizontally- this law states that the sediments usually gets deposited in a horizontal manner due to the influence of gravityLaw of Cross-cutting relationship- this law states that in a particular area when the igneous bodies (such as batholith, plutons etc) intrudes other rocks, then these intruding features are generally younger than the rocks which it cuts, maintaining a cross-cutting relationshipLaw of lateral continuity- this law states that the the sediments at first are deposited and extended laterally in every direction until they meet another geological feature that interrupts its path of lateral extension

A proteins is a sequence of amino acids, which is coded for by sequences of dna. what specific part of a dna sequence codes for the amino acid sequence?

Answers

Codons (a base triplet of DNA consisting of three nucleotides)

A protein is a sequence of amino acids which are coded by the sequence of DNA present in the nucleus of cell. The codes are in the form of codons which is made up of three nucleotide bases each.

What are codons?

Proteins are the building blocks of body. The process of formation of proteins takes place in the ribosome of cell and this process is known as translation. They are formed by the polymerization of amino acids into the form of long chains of polypeptides which undergoes post-translational modifications to form a functional protein.

Codons are the sequence of three nucleotide bases or triplets which codes for specific amino acids as well as stop codons. These codons are the sequence of nucleotides present in the DNA of the cell.

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where do you think trees get there nutrients they need to grow

Answers

From the soil, the Earth, the Sun, the rain.

Plants absorb nutrients and water through their roots,also photosynthesis — the process by which plants create theirfuel — occurs in the leaves.
Trees need a couple things in order to grow! 
Sunlight
Fresh air
Soil
Water/rain 

The ability to control your body movement to change directions quickly and efficiently is called

Answers

agility.  Hope this helps!!!

Which process occurs directly after meiosis II

A. DNA replication
B. cell differentiation
C. reproduction
D. mitosis

Answers

A is correct. DNA replication is just a different way of saying Meiosis II.

Your answer is A DNA replication because that's how twins are born also its not B because the cells have to be the same its not D because mitosis happens first and its not C because reproduction happens after a cell dies and they make more to replace that cell with its job.                                                                                                  Your answer is A.

How do evolutionary psychologists use natural selection to explain our human behavioral tendencies?

Answers

Answer:

Evolutionary psychologists seek to understand how natural selection has shaped our traits and behavior tendencies. The principle of natural selection states that variations increasing the odds of reproducing and surviving are most likely to be passed on to future generations. Some variations arise from mutations (random errors in gene replication), others from new gene combinations at conception. Charles Darwin, whose theory of evolution has for a long time been an organizing principle in biology, anticipated the contemporary application of evolutionary principles in psychology.

Evolutionary psychologists use natural selection to explain the human behavioral tendencies shaped by natural selection, as the genetic variations increases the odds of reproduction in organisms and survival of the future generations.

What is Theory of Natural Selection?

The theory of natural selection states that the variations increases the odds of reproducing and surviving are most likely to be passed on to the future generations.

These variations arise from the mutations- errors in gene recombination, others arise from new gene combinations at conception. Darwin's theory of evolution for a long time anticipated the contemporary application of evolutionary principles in psychology and behavioral pattern of organisms.

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The nurse is preparing to administer digoxin to a patient who has heart failure. the patient reports nausea, vomiting, and a headache. the nurse notes a respiratory rate of 18 breaths per minute, a heart rate of 58 bets per minute, and a blood pressure of 120/70 mm hg. what will the nurse do next?

Answers

The nurse will administer the medication and then, using a stethoscope or monitoring equipment, will get a new heart rate once the mess are on board and see if the patient's heart rate has increased.

Which experiment is most likely to have reliable results? A. An experiment that proves the hypothesis B. An experiment in which there are no controls C. An experiment that confirms predictions D. An experiment in which the outcome is repeatable

Answers

answer choice D, as it shows that the experiment is repeated.

Answer: D. An experiment in which the outcome is repeatable

Explanation:

An experiment is performed by utilizing a suitable methodology. The correctness of the methodology is analyzed by repeating a process several times so as to obtain concordant readings. Similarities in such readings with subsequent attempts will make the methodology as well as the outcomes of the results valid.

On the basis of the above explanation,  D. An experiment in which the outcome is repeatable. is the correct option.

Why is the interaction between predator and prey called a cycle

Answers

Predators are the ones who consume the prey and rely on them as a food source, while prey rely on predators to control their population.

Answer:

Predators are the ones who consume the prey and rely on them as a food source, while prey rely on predators to control their population.

Explanation:

Why are tropical cyclones not likely to occur in mid-latitude regions?

Answers

There are conditions to be met in order to form a tropical cyclone. First, tropical cyclones needs a warm ocean of at least 81 degrees C to develop which is only mostly present in tropical regions where large bodies of water is present and year-round exposure to sunlight. Although mid-latitude areas may have some parts near these oceans, mid-latitude regions are temperate thus, the required ocean temperature cannot be met.
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